I am a post graduate student and new to Latex.. I am facing problems in automatically installation of packages as my software gives error. However i downloaded those packages to install it manually but could not find the procedure. Kindly help me in this regards, Thanks ... The packages are l3packages.tds and l3kernel.tds

Please provide information about your operating system (Windows? Linux? Mac?) and the TeX version (MiKTeX? TeX Live? Linux version of TeX Live?). And of course we need to know the error message, as Johannes said. Also I suggest to use the package manager, because there are dependencies, especially between l3 packages and others (siunitx for example) and l3 is developing fast. Within a TeX version and with it's package manager, versions should be consistent so that packages would work together.